Regular eyesight tests could cut hundreds of road deaths each year, according to HSA Healthcare and the Institute of Advanced Motorists.

Millions of drivers could be unaware their eyesight is below the safe minimum standard. Research shows that if those people driving with sub-standard eyesight knew of the importance of clear vision then accidents could be cut by a tenth.

And the number of accidents in which people are killed or injured could drop by more than 900 saving 38m in accident costs.

Every day thousands of motorists drive without glasses because of vanity, because they've forgotten them, or are driving only a short distance.

HSA's chief executive Des Benjamin said: "Driving is difficult enough already. Shorter, darker days and severe winter weather all contribute to impaired visibility."

The IAM chief examiner, Bryan Lunn says: "It's dangerous and an offence to drive if you cannot see properly. All drivers should get their eyes checked regularly."

The HSA and the IAM have five suggestions to maximise driving visibility:

1. All drivers should get their eyesight checked regularly

2. Glasses/contact lenses should be worn for every journey

3. Windscreens, inside and out, and car lights should be kept clean

4. Check screen washers are not blocked, washer bottle is full and windscreen wipers are in good condition

5. Drivers that wear glasses should try to keep a spare pair in their car.